And it is not for any mortal that Allah should speak to him except by revelation or from behind a veil, or by sending a messenger and revealing by His permission what He pleases; surely He is High, Wise.

Allah's Apostle took an oath that he would abstain from his wives, and at that time his leg had been sprained (dislocated). So he stayed in the Mashruba (an attic room) of his for 29 days. Then he came down, and they (the people) said, "O Allah's Apostle! You took an oath to abstain from your wives for one month." He said, "The month is of twenty nine days."